1. EURODELTA III RCG-Model
Arno Graff
Ummweltbundesamt, Germany

2. OBJECTIVES of RCG-MODEL DEVELOPMENT
Development of a hierarchical AQ modelling system for the regional, urban and local scale that can be used for
target setting and policy assessment
the purposes of the EU air quality directives
Target species: O3, NO2, NOX, SO2, PM10, CO, benzene
Target time scale: hourly concentrations for a complete year
Main developper: Rainer Stern, Free University of Berlin
Funding: UBA Germany
II 4.2-Graff
11th TFMM; May 2010; Larnaca, CY

3. 11th TFMM; 12 - 14 May 2010; Larnaca, CY
RCG – REM/CALGRID
Modelling system of “ medium complexity”
One-way nesting
Horizontal resolution 30 x 30 km² (Europe), 7 x 7 km² (Germany) down to 1 x 1 km² (urban scale)
Vertical resolution Multi-Layer-System in terrain-following coordinates: fixed layers, or dynamic layers, following the vertical movement of the mixing height
Chemistry CBM4 or SAPRC-97
Aerosol formation - Bulk approach for the aerosol modeling
SIA – ISORROPIA (Nenes et al. 1999)
SOA – SORGAM (Schell et al., 2001)
Dry and wet removal processes Dry deposition :
Resistance formulation species dependent)
Wet deposition:
Scavenging coefficient approach for in-cloud and below-cloud scavenging
II 4.2-Graff
11th TFMM; May 2010; Larnaca, CY

4. RCG - POLICY ASSESSMENT
History: Episode modelling Evaluation of measures tackling „summer smog“ - temporary vs. permanent emission reduction -
Nowadays: Longterm modelling of cost effective reduction strategies e.g. for PM10 and NO2 – for complete years
II 4.2-Graff
11th TFMM; May 2010; Larnaca, CY

5. PArticle REduction STrategies
funded by
An integrated measure-based approach to fulfil European air quality targets on a national level
Cause analysis for threshold exceedances
Identification of appropriate emission mitigation measures
Emission reduction scenarios for Germany Baseline year for emissions 2005 Scenarios for 2010, 2015, 2020
Assessment of impacts with CTMs RCG, LOTOS&EUROS, COSMO-MUSCAT
Uncertainties and sensitivity analysis for emissions and AQ-modelling
Cost assessment of technical and non-technical measures
II 4.2-Graff
11th TFMM; May 2010; Larnaca, CY

6. RCG – AIR QUALITY DIRECTIVES
Bilateral consultations with neighboring countries according to 96/62/EC, Art. 8 Assessment of transboundary transport of air and pollution for PM10 and NO2
Postponement of attainment deadlines … according to 2008/50/EC, Art. 22 Assessment of regional background concentrations and contribution of transboundary transport in Germany for
PM and 2011,
NO and 2015
II 4.2-Graff
11th TFMM; May 2010; Larnaca, CY

7. RCG – AIR QUALITY DIRECTIVES
Bilateral consultations with neighboring countries according to 96/62/EC, Art. 8 Assessment of transboundary transport of air pollution for
Postponement of attainment deadlines … according to 2008/50/EC, Art. 22 Assessment of regional background concentrations and contribution of transboundary transport in Germany for
PM and 2011,
NO and 2015
II 4.2-Graff
11th TFMM; May 2010; Larnaca, CY

8. RCG – AIR QUALITY DIRECTIVES
Annual reporting obligations on air quality in Germany … supplemented maps of air quality applying a combining measurements and modelling results by Optimal Interpolation
II 4.2-Graff
11th TFMM; May 2010; Larnaca, CY

9. „Better“ is the enemy of „good“
EURO-DELTA I and II
CITY-DELTA
EMEP- model intercomparison study (2003)
Model inter-comparison study focussing on episodes with elevated PM10 concentrations (2006)
II 4.2-Graff
11th TFMM; May 2010; Larnaca, CY

10. 11th TFMM; 12 - 14 May 2010; Larnaca, CY
II 4.2-Graff
11th TFMM; May 2010; Larnaca, CY